A few days after the Capitol insurrection last January, the FBI got two tips identifying an Ohio man named Walter Messer as a participant, and both cited his social media posts about being there. To verify those tips, the FBI turned to three companies that held a large amount of damning evidence against Messer, simply as a result of his normal use of their services: AT&T, Facebook, and Google.
AT&T gave the FBI Messer’s telephone number and a list of cell sites he used, including one…
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